Physical Science Final Exam-9thgrade

How many electrons can fit on the second shell of a Bohr model?

• 2

• 8

• 18

• 6

According to Heisenberg Uncertainty theory, it is nearly impossible to determine an electron’s exact

• color

• position

• charge

• mass

Which of the following is not a type of orbital?

• s

• d

• p

• x

A subatomic particle that has a negative charge is called a(n)

• molecule

• electron

• element

• compound

Which of the following statements is not true?

• Protons have a positive charge.

• A nucleus has a positive charge.

• Neutrons have no charge.

• Neutrons have a negative charge.

Most of the atom is the

• nucleus

• electron cloud

• filled with protons

• filled with neutrons

What is an atom’s nucleus made of?

What force holds the nucleus together?

• gravitational force

• magnetic force

• nuclear force

• static electricity

Where are the electrons in an atom found?

• nucleus

• in the shells, electron cloud

• with the protons

• with the neutrons

Which of the following statements is correct?

• neutrons = Mass number minus Atomic number

• electrons = Atomic number minus Mass number

• protons = Mass Number minus Atomic number

• neutrons = Atomic number minus Mass Number